I took the index on the words, transformed the range to binary, added three zeros, calculated the sha256 digest, took the primary Section of the hexadecimal to transform it to binary, additional 3 zeros into the eight digits from the binary and obtained 00000010011 which translates to 19 in decimal. https://bookmarkalexa.com/story5030135/5-simple-techniques-for-bip39-seed-phrase